如何从firestore文档中的密钥中获取值

Question

I'm trying to read the values from a firestore document, but I'm having issues. (React Native Expo managed workflow)

code snippet:

let db = firebase.firestore();
//let ref = db.collection(this.props.type).doc(this.props.phone).get();
let ref = db.collection("instructors").doc("0987654321")
let doc = await ref.get();
console.log("setStateFromFirestore");
console.log("data", doc.data()); //this prints fine

data object:

"name": "blah"
"age": "99"

How to get the age or name from such data object?

I've tried these but they don't work:

console.log("data", doc.data().get("age"));
console.log("data", doc.data("age"));
console.log("data", doc.data()["age"]);  

What's the way to do this?
Thanks

Answer 1

You have two options.

As a property on the plain JavaScript object returned by data() :

const data = doc.data()
const age = data.age
console.log(age)

Or directly from the DocumentSnapshot using get() :

const age = doc.get("age")
console.log(age)